Abstract: The research on the characteristics of oil migration mechansim and pathway of oil migrating from K2qn1 source rocks down-ward to F, Y oil layer in Sanzhao Depression shows that the source faults of F,Y oil layer should be the T2 faults. The upper part of those faults disappeared in K1qn1source rocks, and the main faults just cut through T2, along from T2 to T3, from T2 to T4 and from T2 to T5 and distributed in the whole depression. The migration distance of oil downward from K1qn1 source rocks in Sanzhao Depression is mainly influenced by the difference between ancient overpressure of K2qn1 source rock and flow resistance during the process of migration downward and also influenced by combination way of faulted sandstone and mudstone in F, Y oil layer. It makes the deviation of actual downward migration distance with the theoretical migration distance. The actual distance of oil downward from K2qn1 source rocks is 300 m, and the high-value area mainly distributed in oil fields. The control factors of source faults to oil accumulation and distribution are given. The development area of source faults controls the area of oil distribution. The development degree of source faults controls oil downward migration distance. The high fault blocks nearby source faults are favorable for oil accumulation in F, Y oil layer. The distance to source faults controls the productivity of oil wells.